DE7034858U - SHOCK ABSORBER TESTING DEVICE - Google Patents

Description

PATENTANW A L T E

DH.ixG. H. XEGEXDAXK dipl-ixg. H. HVlCK · u ι im. . I> υ ν ν W. SCHMITZ

HAMBlRG · MLNCDEN

7. ISTBLH NGSAN SC HRI FT: HAMBl Ri; 3β NElER WALI. II

TKI. H7US LXU Uli in TCIKUH. NKIiKUlPATFXT BkHUCRC G 70 34 858 2 MiNiUKVi-T mozartstr. a 3

IELI Λ * IJ3 in

TBLEOR. M (GEMPtTIMT MCNCDEN

Monroe Belgium N.V.

UAMBiRu. November 28, 1Q70

Shock absorber testing device

The innovation relates generally to a shock absorber testing device that tests vehicle shock absorbers when installed on the associated vehicle and thereby reduces the time and labor required for shock absorber assessment to the absolute minimum. The shock. Dämpf erprüfeinrichtung according to the innovation is generally effective in the form that it detects and lifts the vehicle wheel assigned to the shock absorber to be tested and thereby causes compression of the assigned suspension spring and a lifting of the part of the vehicle body assigned to this wheel. Once the vehicle wheel and the body section have been properly raised, a release device is actuated which allow the wheel and the body part to free fall, the relative movement between the wheel and the body part being determined and recorded for subsequent analysis. By correctly evaluating the recorded description or the data that define the relative movement between the vehicle wheel and the associated body section, the compression control characteristic curve of the particular to be checked

Shock absorber and its spring-back characteristics at high and low speed can be precisely determined, and the examiner can then use the recorded information t use us the operating table shafts of the shock absorber with the compare pre-recorded "ideal" data from similar shock absorbers with known satisfactory ones Properties were achieved.

The innovation relates generally to improvements in shock absorber testing devices, particularly a new ™ nA improved shock absorber testing device which is capable of determining the spring suspension properties and compression control properties of the shock absorbers when in place on the associated vehicle.

It is therefore the task of the fire to create a new and improved shock absorber tester in order to Check shock absorbers without removing them from the assigned vehicle. This shock absorber testing device is able to the compression control properties of the shock absorber as well as its buckling control properties at high and low speed.

A special feature of this shock absorber testing device of the above kind is that they are relatively simple It is designed and economical to manufacture, is also extremely portable and operates with various types of Tactile and drawing devices used together

7034358-1.4.71

are kar ι to provide a visible indication of the operating characteristics of the shock absorbers tested.

This new and improved shock absorber testing device is intended the compression and rebound control properties of a shock absorber by adjusting the relative motion between the had assigned to the shock absorber to be tested and the part mounted on the shock absorber the vehicle body.

The other features and advantages of the present innovation go from the following detailed description in conjunction with the accompanying drawings. Show it:

1 shows a side view of an exemplary embodiment the shock absorber test device after the hiring in operative connection with a schematic part of a motor vehicle shown,

Fig. 2 is a section taken substantially along the line 2-2 of Fig. 1,

5 shows a side view of an embodiment of the device for scanning and recording the relative movement between the bath and the vehicle body of the vehicle, its shock absorber according to the invention is checked.

Pig. 4 shows a further embodiment of a device for scanning and recording the relative movement between the Fahrz.f ..g imd the wheel during a shock absorber check process? r; em according to the innovation, and

Fig. 5 is a graph showing shock absorber performance characteristics if determined by the test facility according to the innovation.

Figure 1 of the drawings shows a shock absorber tester 10 according to an exemplary embodiment of the innovation in operative connection with a schematically illustrated motor vehicle 12 with a vehicle wheel 14 on one end an axis 16 is rotatably mounted. The vehicle 12 includes a body or chassis 18 which is through a known suspension spring 20 and shock absorber assembly 22 operatively connected to and supported on axle 16 is. The shock absorber assembly 22 extends between the vehicle body 18 and the axle 16 and is well known in the art Way connected with these, and the operating characteristic of this shock absorber is by means of the test device to determine according to the innovation, which is detailed after this is described.

The shock absorber testing device 10 according to the innovation comprises generally an elongated generally flat or planar bearing assembly 24 having two rollers at one end or wheels 26 is provided, which are rotatably mounted on an axle component 28, which with sufficient distance over

1, the rollers 26 are arranged at a distance above the surface 30 and are therefore separated from it of the bearing construction 24 xst is provided with a suitable hand-operated handle 52 or the like, which can be grasped by the operator in order to pivot the end of the construction 24 in the area of the handle 32 upwards so that the wheels 26 touch the floor surface 30 and the operator can move the device 10 back and forth on the wheels, for example, between a storage location and the location where the shock absorber test is to be performed. There are suitable downward facing bearing pads or feet on the underside of the bearing structure 24 JA are provided which serve as a bearing for the construction 24 when the same is in the working position shown in FIG.

A bearing column extends from the bearing structure 24 36 generally vertically upwards, the lower end of which is firmly attached to the bearing structure 24, and preferably is in the form of a generally square or rectangular hollow tubular metal body, according to FIG the illustration has opposite side walls 38 and 40 with a parallel spacing. The bearing column 36 is in the Capable of supporting a liftable sled for operation, indicated generally at 42, and comprised of a housing

or 2inclusion 44, which essentially surrounds the column

ΐ -'-. Ot and in which several guide rollers 46 are arranged,

The circumference of the side walls 38 and 40 of the column 36 increases

Guide and thereby support the slide assembly 42 on the column 36 to perform an adjustable vertical up and down movement. Yon the enclosure 44 extend to two successive inclined Lagerjochkörper 48 and 50 upward (not shown) through suitable openings in the side

^: pass walls 38 and 40 through and inside the bearing

column 36 intersect at a central bearing section 52.

As a means for raising and lowering the slide installation 42 • and thus the wheel 14 and the part of the

Vehicle body 18 is provided with a piston and cylinder assembly, indicated generally by 5 ^, and the can be operated either hydraulically or pneumatically.

! This arrangement comprises a cylinder 56 in which a piston

body 58 mounted to perform a reciprocating motion which is perpendicular to the lower end of a suitable one

arranged piston rod 60 is connected to its

ι upper end with the middle bearing section 52 for assembling

; effect can come to thereby the piston and cylinder arrangement

Connection 54 to be effectively connected to the slot arrangement 42.

j The cylinder 56 is by means of suitable fluid lines

! 62 and 64 with a control valve 66 with foot pedal operation ver

bound, which in turn via a line 66 with a

geexgn = χ; en onelie pressurized fluid connected can turn. As will be apparent to those skilled in the art, causes a ge ^ solenoid coils actuation of the Yen ti Is 56 durcli the "^ ft f? J ρ τηιη ^ ς ιιΐΒπτι by depressing a J? Ußpeda _-> ^ O lifting rmrf lowering the piston body in the cylinder 56 and dsmit a raising and lowering of the slide assembly 42.

The shock absorber testing device 10 according to the hiring is with means for releasable storage of the rubble arrangement provided in a raised position according to the lines indicated in Fig. 1; these funds can be used to Trigger the assembly 42 operate to the same at a Main damper test procedure under the; Influence of gravity free to drop into a relatively lowered position. One such means is by a manually operated release arm or a release handle 72 is provided, which by a suitable pivot pin or a leile 74 rotatably on the upper End of the column 36 is mounted. The era 72 is followed by one. provided below reaching latch device 76, the outwardly protruding release pin 78 can grip the underside of the bearing portion 52 when the arrangement 4-2 is in its raised position, thereby supporting the assembly 42 in that position. When the assembly 42 is triggered is to be, then the outer end of the arm 72 is lifted or counterclockwise in Pig. 1 pivoted through where the pin 78 from the section 52 of the fitting 42

7034358-1. ',. 71

is detached, thereby allowing installation 4-2 to be free to fall down »

The device 10 is provided with an outwardly extending generally horizontally disposed arm or support beam 8C which is fixedly attached to the installation 4-2 at one end and provided with a lifting platform 82 at the opposite end is. The platform 82 has upwardly protruding sidewall portions including a tire or wheel 84- and can be a vehicle wheel, e.g. the wheel 14- effective store to raise and release the carriage assembly 4-2 on the column 56 toward a raised position and move away from her. The bearing structure 24- is preferred provided with a suitable ramp 86, which in Rieh = device on the lifting platform 82 is inclined to thereby a To enable the vehicle 12 to be driven directly into a position in which the wheel in question is the same, which is to the testing shock absorber is assigned before the testing process can be driven directly onto the platform 82 and lowered from it after the test process has been completed. It it can be seen that the storage 24- is also provided with suitable elastic shock-absorbing elements 88, which directly are arranged under the platform 82 and as a spring means for the lifting platform 82 and the stored on it Part of the vehicle body 18 and the wheel 14 are used when they are outdoors during a shock absorber test process Move the case down from its raised position.

In general, the operating characteristics and in particular

the compression and rebound properties of the the device 10 to be tested shock absorber determined by the fact that the relative movement between the vehicle wheel 14 and the body 18 scans and records when these are triggered and in free fall from their raised Position in which they were raised by the carriage 42, drop down. In particular, it can be seen that when lifting the platform 82 as a result of the action of the piston and cylinder drive 54 with the to be tested Shock absorber 22 connected suspension spring 20 is compressed to a slightly greater extent than in their normal or lowered position, in which it supports the vehicle body on the axle 16. This is due to the The fact that the wheel 14 carries a somewhat greater load in a raised position than in its rest position on the ground. if the platform 82 is raised as a result of manipulation of the handle or arm 72, then the wheel 14 and the body will fall 18 together with the platform 82 and the installation 42 freely downward; however, the suspension spring 20 is in shape effective to push or throw the wheel 14 downwardly away from the body 18; this movement of the wheel 14 is through the shock absorbers 22 and in particular by the Ability of shock absorber 22 to control springback is opposed to resistance. Once the wheel 14 in the has fallen as far as possible, i.e. when the platform 82 touches down on the impacts 88, then e drives the shock absorber 22 undergoes a compression stroke due to the fact that the body 18 of the vehicle 12 continues to fall freely,

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after which the vehicle body due to the action of the spring 20 is acted upon in the upward direction, since the spring is again compressed because the body is in Sighting of the vehicle wheel 14 moves downwards and thereby the shock absorber 22 following a springback cycle suspends. It has been found that the relative movement described above between the vehicle wheel and the body can be examined and analyzed in order to determine the springback and Compression control exgen.-adhesion of the shock absorber to be tested to be determined, these properties being compared with those of known satisfactorily working shock absorbers so that the tester can determine whether the rebound and compression control or effectiveness of the to testing shock absorber is within certain predetermined limits within which a satisfactory shock absorber should work.

5 shows a graphic representation of the relative movement of the vehicle wheel 14 and the body 18 as a function of the time during a shock absorber test process and shows that the relative movement between the inside has a series of extreme values or peaks, the amplitude of which corresponds to the extreme values the relative movement between a vehicle wheel and the body of one with a shock absorber of known quality and operating characteristic provided vehicle can be compared. It is particularly evident that when pushing away of the wheel 14 from the body 18 by the action of the spring

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At the initial free fail of the platform 62 a first positive extreme value is formed, which depends primarily on the shock absorption characteristics of the shock absorber, mainly on the rebound control of the same, in particular on the rebound control at high speeds because of the effect of the Spring 20 the actual force acting on the bath ″ is greater than the force of gravity acting on the body 18. The curve indicated by the dotted line 90 in FIG. 5 shows the relative movement between the had 14 and the body 16 It can be seen that at the abscissa value, the extreme value Kr. 1, graphically illustrated in Figure 5, a shock absorber with little or no rebound control has a relatively large extreme value (high amplitude), while a shock absorber with good rebound control has a much smaller extreme value rt has (small amplitude) · Thus, the amplitude of the extreme value is determined by the springback control, and therefore the amplitude of the curve for the abscissa value of the peak Kr. 1 gives an accurate measure of the springback control of the shock absorber 22 at high speed.

The second extreme value generated during the test process or peak no. 2 shown graphically in Fig. 5 is negative, and although they do something through the rebound control of the Is influenced by shock absorber 22, the second peak depends primarily on the compression characteristic of the same.

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As mentioned earlier, the # 2 spike occurs when the platform 82 contacts the stops SS while the body is in motion IS Continuing its Free Fall If the shock absorber 22 has relatively poor compression properties, then the Point Kr. 2 relatively large (in the negative sense) as it aurch the

Curve 92 is shown in Figure 5; However, if the shock absorber has good compression control then the amplitude at peak # 2 will be significantly smaller.

The third extreme value occurring during a test process, i.e., tip number 3 in Fig. 5, which is positive, is dependent on the springback control of the shock absorber 22 at low speed, although at least to some extent it would be through the rebound control and compression control at high speed will. The third peak occurs when the body 18 moves up or away from the wheel 14 as a result of the Upward force exerted thereon on spring 20 after the downward movement of the body 18 after the platform 82 has reached its rest position on the stops 88 has been compressed. How again through the curve 90 indicated in Fig. 5 has little springback control of the tested shock absorber at low speed at tip # 3 has a relatively large amplitude, while with satisfactory springback control of the Shock absorber has a slightly lower amplitude at low speed.

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For comparison, the dotted curve shows at 94 in FIG. 5 the relationship of relative movement between the body and the wheel 14 in the absence of the shock absorber or with a shock absorber that is at a ?. Relative movement practically no dampening wxrkuna between them. It it can be seen that the wheel 14 is pushed down relative to the body and thereby with a still greater acceleration than gravity moves (see curve 96) and reaches the ground faster than in free fall. The vehicle body 18, on the other hand, moves in free fall with increasing acceleration from zero to for maximum acceleration as a result of the decrease in the spring force, as well as the body 18 in the direction of the wheel moved down. The body 18 then vibrates with an essentially constant amplitude and with the natural frequency the spring 20. The relative movement between the wheel 14 and the body 18 when using a relatively rigid Shock absorber, i.e. with unlimited damping, is represented by the dotted line 98; this line shows that if the platform 82 is triggered, both the wheel 14 and the body fall with the acceleration of gravity, since these two Bodies due to the stiff characteristics of the shock absorber behave like a single body, which is what the suspension spring 22 prevents the wheel 14 from being pushed away from the body 18.

It can be seen that when the shock absorber 22 has relatively little rebound control, the relative movement z?; ischen the body 16 and the wheel. 14 is such that the

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Had ^Λ Ά- falls in the same way as a free had, ie. ι the shock absorber 22 has a relatively low damping

-3rung has, however, that the body 15 falls freely and exceeds the zero point a little later than the free state indicated by the curve 92, there. after the sad 14-has reached its lowest point, in your. Shock absorber a compression control stroke is present, as indicated at tip 2, which leads to a reduction in the oscillation frequency of the body 15. If the compression control of the shock absorber 22 is low, then the downward movement of the Eades 1v upon deployment of the platform 82 will take place in response to the shock absorber's rebound control at conditions ranging between compliant and free. The fixed solid curve line 100 denotes the Belativbewegung between the wheel 14 and the vehicle body for a shock absorber having satisfactory Sückfederungs- and Kompressionssteuerchrakteristik "^" represents an ideal to be designated curve is compared with the actual relative movement between Had and body can be compared to determine the quality of the tested shock absorber. In Figure 3s it can be seen that the amplitude of curve 100 at each of peaks 1, 2 and 3 is significantly smaller relative to curves 90 and 92 which indicate little rebound and compression control.

So that the operator of the shock absorber testing device 10 according to the innovation, the rear suspension and compression control characteristics of the shock absorber to be tested 22 can determine, the device 10 is preferably provided with Mittein which the

7034858 -1. a.71 _ ₁₅ _

Ampli-Jew or magnitude of the peaks optically, show how the SCIU Ittens are recorded 4-2 and carried by it from the platform 82 ~> elativbewegung of Rade _o 14- with respect to the body 18 when triggered. This visual indication ti-arm to be made in the form of a graph, as shown in Fig.>, Or they are karm optionally also given in Fora · an electrical signal, which will be described thereafter. The record or signal can be compared by the operator to a set of ideal carts, graphs, or signals, which can be cataloged according to the sizes and types of shock absorbers being tested. While a large number of different types of devices can be used to sense and detect the relative movement between the had 14 and the body during the shock absorber testing process, FIGS. 3 and 4 -two preferred devices shown and described, the device according to Pig. 3 gives a graphical display of the relative movement between the bath "*""" of the body, similar to the graphs of FIG. 5, and the device shown in FIG. 4 gives an electrical signal proportional to the magnitude or amplitude of the generated during the testing process Tips provides what is described in detail below.

Fig. 3 shows that the storage 24 - with a sensing and recording device 1C2 is provided, which consists of a

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703 £ 8E8-u.7i

104 - 16 - at one part the Vehicle- 11th consists , the Clamp bracket

body 18, for example on the vehicle fender or the like. Can be releasably attached. The bracket 104 may _f on an adjustable 3Ü by means of a hinge device 106; el to be pivotally attached 108, wherein the bracket is slides on an upwardly inclined rod or shaft 110 and adjustably secured thereto. The shaft in turn is connected via a suitable pivot connection 112 to the lower end of a shaft or rod which can be reciprocated in a vertical direction. The lower end of the rod 114 and the connection are guided by a suitable guide device consisting of a sleeve 116, which slides on a guide body 118 in a vertical direction, to perform a vertical up and down movement, the rod 114 to perform a back and forth Movement is guided within a suitable sleeve 120. The upper end of the rod 114 is operatively connected by a suitable pivot or hinge connection 122 and 124 to a generally horizontally disposed body 126 which is pivotably or rotatably connected at 128 to a bearing bracket 130. The outer end of the body 126 is capable of effectively carrying or supporting a recording pen 132 or the like which transmits the relative movement of the body 126 to a recording disk 134 or a scale which is rotated at a predetermined speed by means of a suitable electric motor 136 or the like. Can be rotated in order to introduce a time factor into the graphical representation. It can be seen that the scale 134 can be connected to the platform 82 by any components indicated at 138

is connected, thereby maintaining a predetermined size relationship between the bracket 104 and the platform 82 is ensured. In operation, after the platform 82 has been triggered, the bath 14 and that carried by it move Part of the vehicle body 18 in free fall in the manner previously described, resulting in a downwardly directed one Movement of platform 82 and bracket 104 resulted in such movement of bracket 104 causing one simultaneous movement of rods 110 and 114, which in turn cause pivoting movement of body 126, the movement of the body 126 by the recording spring 132 the scale 134 is recorded. This leads to a graphic representation of the relative displacement of the vehicle body and the wheel 114 as a function of time on the scale 134. This graph is to be compared with the graphs of FIG. 5 and can therefore can be used in determining the rebound and compression control characteristics of the shock absorber 22.

Fig. 4 shows a device for generating an electrical signal as a function of the relative movement between the wheel 14 and the body 18 during a shock absorber test procedure. The device comprises a straight transducer, e.g. a potentiometer 140 having a housing 142 and a relatively movable spindle or armature "-4, the is connected to the body part of the vehicle 12 via an adjustable bracket 146 and a clamping device 148.

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The housing 142 can be connected by suitable bearing brackets 150 and a swivel connection 152 to a clamping device 1 ^C 4, the two spindle elements 156 and 1p8 aux «eist, which can come into cooperation with the rim of the wheel 1A- and are accordingly adjustable so that you can adapt the device 154- to different wheel rim sizes. The potentiometer 140 can be connected to an electrical amplifier circuit 160 which receives electrical signals from the potentiometer 140 which are proportional to the relative displacement between the vehicle body 18 and the wheel 14; the amplifier converts these signals into a form in which they can be applied to an associated readout circuit 162 which can be connected to a readout meter 164 for optical reading and / or a digital abiasing device 166, both of which provide a visual indication of the magnitude or amplitude of the during operation Give shock absorber test occurring peaks. The details of the electrical circuitry involved in generating the aforementioned electrical signals will be apparent to those skilled in the art and, therefore, have been omitted from this description in order to simplify the present disclosure.

In operation of the shock absorber testing device 10 according to the innovation the valve 66 is actuated accordingly so that the carriage 42 is in its lower position, whereby the vehicle can be arranged with the shock absorber to be tested so that the wheel connected to the shock absorber rests on the ramp 86

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and is driven up to Flat rfore 82. After that it will Peda- 70 actuated accordingly to act on the To effect piston and cylinder assembly 54, whereby the Carriage assembly 42 from the position shown in solid lines upward in aie in FIG. 1 in dotted lines The position shown in the lines is moved. As already mentioned above, such an upward movement causes the Installation 42 a simultaneous upward movement of the platform 62, whereby the vehicle wheel carried by it and that of this supported part of the vehicle body is raised. As soon as the carriage 42 is raised accordingly, the Handle 72 moved into a position in which the pin 78 comes into contact with the underside of the bearing portion 52 and thereby carriage 42, platform 82, and vehicle wheel and holds the vehicle body securely in a raised position. Then the application of the piston and cylinder installation 5 ^ - dismantled by appropriate actuation of the valve 66 and thereby retracting the piston rod 60 to permit the assembly 42 to fall freely.

If the test procedure itself is to be carried out, the handle 72 is acted upon in a counterclockwise direction in FIG him stored vehicle body leads. During such a free fall of the vehicle body and the vehicle body

following charging of the vehicle body of the associated under test shock absorber Aufhängungsf e :. "c the relative movement between the Had and the Fahrzeur ^ can arosserie by any means, including one of the two shown in FIGS. 3 and 4 upwards due to the effect Devices are scanned and recorded. The record obtained in this way can then be compared in the above-described "." testing shock absorber has satisfactory operating characteristics or whether it should be repaired or replaced. When the test process is completed, the vehicle can be driven down from platform 82 via ramp 86 before the next shock absorber test.

Although the preferred embodiment shown here the tasks of the innovation fully fulfilled, but it should be pointed out that the present innovation can also be modified can without deviating from the scope of innovation.

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Claims (1)

Protection claims 1. Shock absorber testing device for testing shock absorption of shock absorbers installed in a vehicle with a sprung part and supporting wheels, characterized by a bearing construction (34), lifting means (36, 80, 42, 54) on this bearing construction, which is equipped with a supporting bath (14-) of the vehicle (12) can work together and exert an upward force on this had, thereby lifting the had and the vehicle part carried by the wheel from a relatively non-raised position to a relatively raised position, Lutte! (46 »3β, 49), which allow the raised wheel and the vehicle part mounted on it to fall freely from the raised position to the non-raised position, as well as means (102, 140) for sensing the relative movement between the body part (18) of the vehicle and the vehicle wheel (14) during the free fall of the same to determine the operating characteristics of the associated shock absorber (22). 2. Apparatus according to claim 1, characterized by ilittel for recording the relative movement between the sprung part (10) of the vehicle (12) and the vehicle wheel (14) during and after the free fall of these parts. 3 · Device according to claim 2, characterized in that the means for sensing the relative movement between the sprung, 'υ ei I of the vehicle' and the vehicle wheel one Form recording device (132, 134-). K * Device according to Claim 2, characterized by means (136, 134 ·) for introducing a time factor into the recording of the relative movement between the. The sprung part of the vehicle rfnA the vehicle wheel during and after the free fall of the same 5 · Door direction according to claim 4, characterized in that the hit egg to introduce a time factor a rotatable Dial (134-) and drive belt (136) for selective Rotation of the dial ^ it are. 6. Apparatus according to claim 1, characterized ^ indicates that the lifting device includes a platform (52), which is in direct contact with the underside of the vehicle wheel to be lifted. 7. Device according to claim 6, characterized by means (72, 76) for optional triggering of the platform device (82), in the position of the same in the relatively raised position, na the free fall of the vehicle wheel (14-) and the on to achieve the vehicle wheel supported vehicle part. 6. Apparatus according to claim 1, characterized in that the lifting device (36, 60, 4 ^ 2, 5> 4) includes a piston and cylinder device (5 ⁴ O). 7Q34858-U 71 9. Apparatus according to claim 1, characterized in that the bearing structure (24-) is portable and therefore light can be transported. 10. The device according to claim 1, characterized by means (102, 145) for recording the relative movement between the sprung part (18) of the vehicle (12) and the vehicle wheel (14) during and after the free fall of the same, with devices for introducing a time factor in the record of the relative movement between the sprung Part of the vehicle and the; Vehicle wheel after the free fall of the same, this means introducing a Time factor a rotatable scale (134) and drive means (136) to optionally rotate this scale and wherein the lifting device (36, SO, 42, 5 ^) a rlattform (82) which can be brought into engagement with the underside of the vehicle wheel to be lifted, and the lifting device a piston and cylinder device (54) comprises, the storage structure (24) is portable and can therefore be easily transported. ο Device according to claim 1, characterized in that the sensing device comprises a transducer (140). 12. The device according to claim 11, characterized in that a first part (142) of the measuring converter (140) with the Vehicle wheel (14) and a second part of the transducer with the part (18) of the vehicle (12) supported by the wheel can be connected.